<!DOCTYPE html>
<html lang="zn-gn">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .box1 {
            width: 800px;
            height: 120px;
            line-height: 120px;
            margin: 20px auto;
            /* border: 1px solid blue; */

        }

        .miaosha {
            position: relative;
            float: left;
            width: 550px;
            height: 100%;
            background-color: red;
            text-align: center;
            color: #fff;
            font-weight: 700;
        }

        .miaosha div{
            position: absolute;
            right: 0px;
            top: 0;
            height: 0;
            width: 0;
            border-color: transparent #fff transparent transparent;
            border-width: 120px 12px 0 0;
            border-style: solid;

        }
       
        .om {
            float: left;
            height: 100%;
            width: 250px;
        }
    </style>
</head>

<body>
    <div class="box1">
        <span class="miaosha">￥1660
            <div></div>
        </span>
        <span class="om">￥6789</span>
    </div>
</body>

</html>